Dietrich von der Ropp was temporarily on board U-35 at the request of commander Hans-Rudolf Rösing for the patrol to Ponta Delgada  (Azores). After this patrol, he reported back to U-11. He later received command of his own U-Boat, U-12, and was killed when it encountered a mine in the English Channel in early October 1939. His body washed ashore in France, and was buried there.